JPWO2010098362A1 - Light pattern projection device, mounting table, and sphere rotation device - Google Patents

Abstract

The present invention has a spherical shell 2 having a pattern due to a difference in light transmittance and / or transmitted light wavelength, and sliding means 5 provided inside the spherical shell 2 and sliding on the inner surface of the spherical shell 2. 1 is a light pattern projection apparatus 1 including a sliding body 4 and a light emitting body 6 provided on an upper portion of the sliding body 4. Since the sliding body 4 slides freely in the spherical shell 2, it always exists under the spherical shell 2 due to gravity. When the illuminant 6 emits light, the light illuminates the upper part of the spherical shell 2, so that the pattern of the spherical shell 2 is radiated to the outside and projected onto, for example, the inner wall surface of the room where the observer is present. Thus, the light pattern projection apparatus of the present invention can accurately project celestial bodies with a simple configuration. Note that the pattern projected by the optical pattern projection device of the present invention is not limited to a celestial body.

Description

  The present invention relates to an apparatus for projecting a pattern such as a celestial body onto a wall surface.

  A celestial sphere is known as a device for learning the structure of a celestial body and its movement. However, a celestial sphere is a projection of a star or the like on a spherical surface, and is different from the actually observed celestial body in that it is observed from outside the celestial sphere. Therefore, there is a drawback that it is difficult to understand the state of the celestial body sensuously.

  In order to intuitively understand the state of celestial bodies, it can be said that it is desirable to observe stars as if looking up from the celestial sphere. As such a device, there is a planetarium that projects a celestial body on a wall surface with light. However, planetariums are generally made very precisely and are also very expensive. Moreover, since the size is large, there is a problem that it cannot be installed in a place where sufficient space cannot be secured. Moreover, since it is a complicated apparatus, operation is not easy. Therefore, it is not suitable for use at home or for use in school for students to learn about celestial bodies.

  On the other hand, although it is not the purpose of projecting the state of a celestial body, there has been a light projection device that projects a light pattern on a wall surface (see, for example, Patent Document 1). Therefore, it is conceivable to improve such a light projection device as a device for projecting a celestial pattern. However, each of them has a problem that it is relatively complicated and is not cheap, and there is a problem that it is not easy to cover all 360 degrees of celestial bodies.

JP 2004-147703 A

  The present invention has been made to solve the above-described problems, and the problem to be solved is a structure that is much simpler than that of a conventional planetarium apparatus, and is very easy to operate. Accordingly, it is an object of the present invention to provide an optical pattern projection device capable of projecting a celestial body of any angle onto a wall surface and a mounting table thereof.

The light pattern projector according to the present invention, which has been made to solve the above problems,
A light pattern projection device for projecting a light pattern onto a wall surface,
A spherical shell having a pattern due to a difference in light transmittance and / or transmitted light wavelength;
A sliding body provided inside the spherical shell and having sliding means for sliding on the inner surface of the spherical shell;
A light emitter provided on an upper portion of the sliding body;
It is characterized by providing.

  In addition, the light pattern projection apparatus of the present invention may further include a mounting table that rotatably holds the spherical shell. In this case, it is preferable that the mounting table has a rotation mechanism that rotates the spherical shell.

  According to the light pattern projection device according to the present invention, the sliding body freely slides inside the spherical shell. Therefore, due to gravity, the sliding body is always located below the spherical shell. When the illuminator provided on the upper part of the sliding body emits light, the light irradiates the upper part of the spherical shell, and the pattern provided on the spherical shell irradiates the inner wall surface of the room where the observer is present. The projected pattern can be changed very easily and freely by rotating the spherical shell by the observer or by rotating the spherical shell by the rotation mechanism provided on the mounting table on which the spherical shell is mounted. be able to.

  The light pattern projector according to the present invention has a very simple structure. Therefore, it can be easily reduced in size and can be produced at a very low cost. Therefore, it is possible to actively learn the celestial mechanism by using the light pattern projection apparatus according to the present invention in places and situations where space and cost were impossible in the past, for example, in school education. It becomes possible.

Sectional drawing of 1st Embodiment of the optical pattern projector concerning this invention. Sectional drawing of 2nd Embodiment of the optical pattern projector which concerns on this invention. The schematic diagram of 2nd Embodiment of the optical pattern projector concerning this invention. Sectional drawing of 3rd Embodiment of the optical pattern projector which concerns on this invention. Sectional drawing of 4th Embodiment of the optical pattern projector which concerns on this invention. The top view of the mounting base which concerns on 4th Embodiment. The perspective view of an omni wheel. The top view of the mounting base of 5th Embodiment of the optical pattern projector concerning this invention.

  Hereinafter, some embodiments of a light pattern projection apparatus according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a cross-sectional view of a first embodiment of a light pattern projection apparatus 1 according to the present invention. The light pattern projection apparatus 1 basically includes a spherical shell 2, a sliding body 4, a light source 6, and a battery 8.

  The light pattern projector 1 according to the present invention projects a light pattern onto a wall surface. This wall surface is usually the inner wall surface (including the ceiling) of the room where the user (observer) is.

  The spherical shell 2 is a sphere having an internal cavity 3 inside. The surface is provided with a pattern due to the difference in light transmittance and / or transmitted light wavelength. That is, it is possible to project patterns composed of various brightness and colors.

  The sliding body 4 is provided in the internal cavity 3 that is the inside of the spherical shell 2. A sliding means 5 is provided on the sliding body 4. The sliding means 5 may be anything as long as it reduces the friction coefficient between the inner surface of the spherical shell 2 and the sliding body 4. For example, the spherical shell 2 can be made of a hard plastic such as acrylic or polypropylene, and the sliding means 5 can be a similar hard plastic chip with a small contact area with the inner surface of the spherical shell 2. Further, the sliding body 4 may be provided with a spherical pit, and a sphere that freely rotates may be disposed therein. A wheel body that freely rotates in all directions, such as an omni wheel, can also be employed. In any case, the inner surface of the spherical shell 2 may be coated with a friction reducing agent. As a result, the sliding body 4 slides freely in the spherical shell 2 and is always located at the bottom of the spherical shell 2 by gravity when it is stationary.

  A light source 6 composed of a high brightness LED or the like is provided on the upper part of the sliding body 4. A battery 8 for supplying power to the light source 6 is provided inside the sliding body 4. The battery 8 is preferably a non-contact rechargeable battery that can be charged without contact from the outside.

  When the light source 6 is turned on, a pattern existing on the upper part of the sliding body 4 is projected onto the wall surface. A user can project a favorite pattern on the wall surface by arbitrarily rotating the spherical shell 2.

  It is preferable that a predetermined impact sensor or the like is included in the sliding body 4 so that the light source 6 is turned on or off when the user gives a light impact to the light pattern projection device 1. Alternatively, a magnetic sensor may be provided inside the sliding body 4 so that the light source 6 can be turned on and off alternately (that is, in a toggle manner) by bringing the magnet close to the light pattern projection apparatus 1. .

  The light pattern projection apparatus of the present invention can be suitably used particularly for projecting astronomical patterns. Hereinafter, an embodiment (second embodiment) in this case will be described with reference to FIG. 2 which is a sectional view and FIG. 3 which is a schematic view.

In the present embodiment, the sliding body 4 includes a circular surface portion 7 having a diameter equal to the diameter of the spherical shell 2 and being light-impermeable. That is, the circular surface portion 7 always passes through the center of the inner cavity 3, that is, the center of the spherical shell 2 regardless of the relative positions of the spherical shell 2 and the sliding body 4. However, in practice, the diameter of the circular surface portion 7 is slightly smaller than the diameter of the internal cavity 3 so that the spherical shell 2 and the sliding body 4 can move relative to each other.
2 and 3, the sliding body 4 is depicted as a hemisphere, but this shape is not limited to a hemisphere.

  In the present embodiment, when the sliding body 4 is positioned below the spherical shell 2, the circular surface portion 7 is always horizontal.

  The light source 6 is provided at the center of the circular surface portion 7. That is, the light source 6 is installed at the center of the spherical shell 2 itself. This is to prevent the projected image from being distorted when a celestial pattern is projected. The light source 6 is arranged so that when it is turned on, light is emitted only to the inner cavity 3 side of the spherical shell 2 and does not travel to the sliding body 4 side. In particular, the light source 6 preferably emits light uniformly in all directions of the internal cavity 3. For this reason, the light source 6 may be covered with a predetermined concave lens as necessary.

  In the example of FIG. 3, the star is drawn as if it is a light opaque part (in this case, the star is projected as a shadow on the wall surface). A pattern may be formed so that a portion other than is a light-impermeable portion (in this case, a star is projected as light on the wall surface). Of course, you can also color the stars and make them different in size.

  When the light source 6 is turned on, as described above, light is emitted only to the inner cavity 3 side of the spherical shell 2, so that only stars at angles actually observed on the ground are projected onto the wall surface. That is, the circular surface portion 7 serves as the ground. Then, by arbitrarily rotating the spherical shell 2 by the user, it becomes possible to project the starry sky at various times in various places on the earth, for example.

  The outer surface of the light pattern projection apparatus 1 of the present invention is a spherical shell 2 itself, that is, a sphere. Therefore, in order to improve the stability, a mounting table 9 on which the light pattern projector 1 can be mounted is prepared as in the third embodiment of the present invention shown in FIG. 4, and the light pattern projector 1 is mounted thereon. It is good to put.

For example, the mounting table 9 may include a rotation mechanism that rotates the light pattern projection apparatus 1 at a predetermined speed in an arbitrary rotation direction. The rotation mechanism can be composed of a plurality of rotation means 10 that rotates while contacting the outer surface of the spherical shell 2 and a rotation drive mechanism 11 that electrically drives the rotation means 10, for example. The rotating means 10 may have any form as long as it can make the spherical shell 2 face in an arbitrary direction, that is, an arbitrary pattern can be projected. For example, two different wheels that rotate the spherical shell 2 at mutually independent speeds in two directions orthogonal to each other may be used, or the top surface of the mounting table 9 may be a concave spherical surface, It can also be set as the structure which provided the wheel which rotates in the direction perpendicular | vertical to each line segment in each center of a great circle line segment. In this case, the spherical shell 2 can be rotated more freely by adjusting the rotation speed of each wheel. As the rotation means 10, for example, an omni wheel or the like can be used in addition to a normal wheel. In any case, in order to rotate the spherical shell 2 reliably and stably, it is preferable that the friction between the rotating means 10 and the outer surface of the spherical shell 2 is as large as possible (for example, a portion in contact with the spherical shell 2 is a rubber tire). etc). As the rotation drive mechanism 11, it can be set as the motor which drives these wheels and a wheel.
Furthermore, by providing a device for controlling the rotational drive mechanism 11 and a device for detecting the rotational position of the spherical shell 2, the position of the pattern of the spherical shell 2 is controlled, for example, “March 1, 2009 22:30 It is possible to project a starry sky at a specific place at a specific time, such as “Night Kyoto night sky”.

  The mounting table 9 can incorporate a charging device for charging the battery 8 in a non-contact manner. Alternatively, the mounting table 9 may be provided with a power supply mechanism that allows the user to arbitrarily turn on / off. In this case, a power receiving mechanism for receiving the power from the power supply mechanism in a non-contact manner may be provided in the sliding body 4 instead of the battery. Moreover, while the magnet 12 is included in the mounting table 9 and the magnetic sensor 13 is included in the sliding body 4, the light source 6 is turned on while the optical pattern projection device 1 is mounted on the mounting table 9. The light source 6 can be turned off when the light pattern projection device 1 is removed from the mounting table 9.

  5 and 6, the top surface of the mounting table 9 is a concave spherical surface 15, and three omni wheels 16 a to 16 c are provided at the centers of three great circle segments L 1 to L 3 that are orthogonal to each other on the concave spherical surface 15. 4th Embodiment which rotates the spherical shell 2 with these omni wheels 16a-16c is shown. Although not shown, the concave spherical surface 15 has three bearing recesses, and the omni wheels 16a to 16c are rotatably supported by the bearing recesses. The rotation shafts 17a to 17c of the omni wheels 16a to 16c are perpendicular to the line segments L1 to L3 and parallel to the tangential direction of the concave spherical surface 15 at the mounting positions of the omni holes 16a to 16c. With such a configuration, the omni wheels 16a to 16c rotate in the directions of arrows Aa to Ac.

  Further, in the mounting table 9, motors 18a to 18c for rotating the rotary shafts 17a to 17c, sensors 19a to 19c for detecting the rotation amounts of the rotary shafts 17a to 17c, and signals from these sensors 19a to 19c are received. A control device 20 for controlling the driving of the motors 18a to 18c is accommodated. The control device 20 stores control programs for the motors 18a to 18c, and the control device 20 drives the motors 18a to 18c according to the detection signals and control programs of the sensors 19a to 19c.

  FIG. 7 shows an example of the omni wheel used. The omni wheel includes a rotating body 21 and eight barrel-shaped rollers 22 that are rotatably held by the rotating body 21. The rotating body 21 includes two wheels 23 having the same shape. Each wheel 23 has four recesses 24 formed on the outer periphery of the wheel 23 every 90 degrees, and a barrel roller 22 is rotatably held in each recess 24. The two wheels 23 are combined so that the concave portions 24 are arranged so as to be shifted by 45 degrees to form one rotating body 21. As a result, there are eight barrels on the outer periphery of the rotating body 21. The shape rollers 22 are alternately positioned on the one wheel 23 and the other wheel 23 every 45 degrees. The barrel roller 22 is configured such that the frictional force with the spherical shell 2 is smaller in the non-rotating direction than the rotating direction of the barrel roller 22, and when the omni wheel is driven by the motor. The rotation of the omni wheel is not hindered by the barrel roller.

  Further, four engagement convex portions 26 surrounding the periphery of the insertion hole 25 of the rotating shaft are provided on both end surfaces of each wheel 23, and the engagement convex portion 26 of one wheel 23 is connected to the other wheel 23. By fitting between the engaging projections 26, both wheels 23 are detachably connected.

  With the above configuration, the barrel roller 22 rotates in the directions of arrows Ba to Bc orthogonal to the rotation direction of the omni wheels 16a to 16c. Therefore, when the control device 20 drives one of the three motors 18a to 18c, a predetermined omni wheel is rotated by the motor, and as a result, the spherical shell 2 is rotated in any direction of the arrows Aa to Ac. . Moreover, the barrel-shaped roller 22 which contacts the spherical shell 2 of the remaining omni wheel rotates with the spherical shell 2.

  Therefore, the spherical shell 2 can be rotated in an arbitrary direction by selectively rotating the motors 18a to 18c at an appropriate timing. Furthermore, by providing the sensors 19a to 19c, the rotational position of the spherical shell 2 can be controlled with high accuracy.

  In the example of FIGS. 5 and 6, the three omni wheels 16a to 16c are provided at the centers of the three great circle line segments L1 to L3. However, as in the fifth embodiment shown in FIG. Two omni wheels may be provided in each of L1 to L3. When two omni wheels arranged on the same line segment are rotated simultaneously, it is necessary to rotate them at the same speed and in the same direction.

  5 and FIG. 6, the omni wheel is provided on the three great circle segments orthogonal to each other, but the omni wheel may be provided on the three circle segments intersecting each other. Even with such a configuration, the spherical shell 2 can be rotated in three directions. Further, a simple wheel may be provided instead of the omni wheel.

  If you only want to enjoy the change in the pattern projected from the light pattern projection device by rotating the spherical shell, there is no need to control the rotational position of the spherical shell, so a sensor that detects the rotational position of the spherical shell is unnecessary. .

  The light pattern projection apparatus according to the present invention has been specifically described above. However, it is obvious that the above-described embodiments are merely examples, and additions and modifications can be freely made within the spirit of the present invention. I do not care.

  For example, a semi-transparent (for example, milky white) shell can be further provided outside the spherical shell 2. In this configuration, the pattern irradiated from the light pattern projection device is projected onto the translucent shell. The observer observes the projected pattern from outside the translucent shell.

In order to easily change the pattern, the spherical shell 2 can be composed of a transparent sphere and a pattern sphere provided outside thereof. By using a replaceable pattern sphere, it is possible to enjoy various types of light patterns. Moreover, not only the starry sky but also the sun and the moon can be projected.

DESCRIPTION OF SYMBOLS 1 ... Light pattern projector 2 ... Spherical shell 3 ... Internal cavity 4 ... Sliding body 5 ... Sliding means 6 ... Light source 7 ... Circular surface part 8 ... Battery 9 ... Mounting stand 10 ... Rotating means 11 ... Rotation drive mechanism 12 ... Magnet 13 ... Magnetic sensor 15 ... Concave spherical surfaces 16a to 16c ... Omni wheels 17a to 17c ... Rotating shafts 18a to 18c ... Motors 19a to 19c ... Sensor 20 ... Control device 21 ... Rotating body 22 ... Barrel roller

Claims (18)

A light pattern projection device for projecting a light pattern onto a wall surface,
A spherical shell having a pattern due to a difference in light transmittance and / or transmitted light wavelength;
A sliding body provided inside the spherical shell and having sliding means for sliding on the inner surface of the spherical shell;
A light emitter provided on an upper portion of the sliding body;
A light pattern projection apparatus comprising: The sliding body has a circular surface portion having a diameter equal to the diameter of the spherical shell and non-light-transmitting;
The light pattern projection device according to claim 1, wherein the light emitter is provided at a center of the circular surface portion.   The optical pattern projection device according to claim 1, wherein the pattern provided on the spherical shell is a celestial pattern.   A battery for supplying power to the light source is provided inside the sliding body, and the battery can be charged in a non-contact manner from the outside of the light pattern projection device. 4. The light pattern projection apparatus according to any one of 3 above.   The optical pattern projector according to claim 1, further comprising a mounting table that rotatably holds the spherical shell.   The optical pattern projection apparatus according to claim 1, wherein the mounting table includes a rotation mechanism that rotates the spherical shell. The mounting table has a concave spherical surface that receives the spherical shell from below,
The light pattern projection device according to claim 6, wherein the rotation mechanism includes a rotation member provided on the concave spherical surface and in contact with an outer peripheral surface of the spherical shell, and a motor that rotationally drives the rotation member. . The rotating member is composed of three or more wheels provided at least one on each of three circular segments intersecting each other on the concave spherical surface,
The light pattern projection apparatus according to claim 7, wherein the rotation mechanism rotates each wheel.   9. The light pattern projection apparatus according to claim 8, wherein the wheel rotates about an axis perpendicular to the line segment and parallel to a tangential direction of the concave spherical surface.   The light pattern projection apparatus according to claim 9, wherein the wheel is an omni wheel.   The said rotation mechanism is provided with the position detection sensor which detects the rotation position of the said spherical shell, and the control apparatus which controls the drive of the said motor based on the detection result of the said position detection sensor. The optical pattern projection apparatus in any one.   A mounting table for rotatably holding the light pattern projection device according to claim 1.   The mounting table according to claim 12, further comprising a rotation mechanism that rotates the spherical shell. A sphere rotating device for rotating a sphere,
A mounting table having a concave spherical surface for receiving the sphere from below;
A rotating member provided on the concave spherical surface and in contact with the outer peripheral surface of the sphere;
A sphere rotating device comprising: a motor that rotationally drives the rotating member.   The spherical rotating apparatus according to claim 14, wherein the rotating member includes three or more wheels provided on at least one line segment of three circles intersecting each other on the concave spherical surface. .   The sphere rotating device according to claim 15, wherein the wheel is an omni wheel.   The omni wheel is formed by connecting two rotating bodies in an axial direction with an angular difference so that the barrel rollers on the outer peripheral portion of each rotating body are staggered. The sphere rotation device according to claim 16.   The sphere according to any one of claims 14 to 17, further comprising: a position detection sensor that detects a rotational position of the sphere; and a control device that controls driving of the motor based on a detection result of the position detection sensor. Rotating device.

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